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| Spark Plugs |
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Does the standard resistor have effect on the required voltage? |
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About 99% of today’s cars are equipped with resistor spark plugs. Most of the standard spark plugs and all the longlife and iridium power spark plugs have a built in resistor of 5k Ohm. This has no effect on the available voltage at the spark plug. Often people fear the word resistor because it makes them think the voltage and current is limited. The resistor that is fitted in the spark plug is 5k Ohm. This is nothing compared to the resistance of the air or the air/fuel mixture in an engine. There is no measurable effect on performance. The resistor is necessary to prevent problems with engine management systems, cellular telephones and datalogging equipment. The spark plug is the best place to put the resistor, because this is the closest you can get to the spark itself. The resistor value of a resistor spark plug and resistor leads and caps is less than 0.01% of the total resistor value of the air/fuel mixture inside the engine. |
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